JVC RS4500 (native 4K laser projector)

[ARROW-AV]

It will be very interesting to see what the Radiance Pro brings to HDR calibration for projectors. I have one in my rack ready to go once that feature is enabled with the Calman software. It is interesting that THX specifies 30 fL for UHD content. I can see shooting for a peak white of 30 fL with HDR to preserve some headroom but for SDR 4K content that is really bright on a large screen. I tried 30 fL with standard Blu-ray to see what I thought and it was just way too much for my viewing. 16-17 fL seems to be a really great sweet spot in that it looks extremely vibrant and natural without much in the way of fatigue. Some occasional jumps from dark to bright sequences can be aggravating though.

My thoughts exactly Kris. But in case it's not obvious 4K UHD content is native, not upscaled, in other words if it's a pixel-shift-pseudo-4K or HD upscaled to 4K then the recommendation is the usual 14-16 fL... The 30 fL recommendation is specifically regarding HDR and/or native 4K UHD, wherein I am thinking that more often than not these come together, or at the very least the extent to which they transpire concomitantly is increasing and hence the 30fL or not 30fL with SDR 4K is somewhat a moot point... But as it happens I agree with you

Where in my own mind I have 30fL intended for 4K UHD HDR and circa 16 fL for pretty much everything else

[Kris Deering]

Hi Kris

How much horse power (light output) would a projector need to provide 30ft lambert white peaks for HDR on a larger screen like mine (14' wide 2.40 1.3 gain)?

Mike has you covered there. For that kind of light output you'd be in high laser mode and would use the HDR color mode, so no filter. You lose a bit on red saturation but the rest of the colors are about the same. With that setup you'd get around 45-50,00:1 with the laser dimming enabled, so big jump from your Sim2.

[AVSCraig]

Mike has you covered there. For that kind of light output you'd be in high laser mode and would use the HDR color mode, so no filter. You lose a bit on red saturation but the rest of the colors are about the same. With that setup you'd get around 45-50,00:1 with the laser dimming enabled, so big jump from your Sim2.

This certainly bodes well for my smaller screen(s) !! 

[DavidHir]

Sounds very impressive!  Factoring in that kind of contrast with everything else...must be a lot of 'wow' factor going on.

[AVSMike]

On my screen I should be able to get a max of 37FL in scope and 58FL in 16:9 and that is in BT2020 mode. Max calibrated lumens in Rec709, max of 47FL scope and 83FL 16:9. Lack of brightness will not be a problem.
Obviously I will be closing down the iris/using medium power.

[Kaiser]

What is the approximate loss of light output with the filter engaged vs HDR color mode?

[AVSMike]

What is the approximate loss of light output with the filter engaged vs HDR color mode?

Told around 30%. Will let Kris say what he is actually seeing.

[thebland]

On my screen I should be able to get a max of 37FL in scope and 58FL in 16:9 and that is in BT2020 mode. Max calibrated lumens in Rec709, max of 47FL scope and 83FL 16:9. Lack of brightness will not be a problem.
Obviously I will be closing down the iris/using medium power.

Thanks guys!

Mike, Kris, Craig , what type of output would I expect in 2.40 mode for a 4K HDR (peak white)? My throw to my 14' wide micro peer is ~26'.
Thanks!

[AVSMike]

Thanks guys!

Mike, Kris, Craig , what type of output would I expect in 2.40 mode for a 4K HDR (peak white)? My throw to my 14' wide micro peer is ~26'.
Thanks!

I would guess around 26/27FL without the DCI filter in place.

[Pultzar]

Is it true that longer throw means higher CR and shorter throw is higher lumens?  If so are there specs on the differences?

Also how does sharpness and chromatic aberrations change throughout the zoom range?

[AVSCraig]

Is it true that longer throw means higher CR and shorter throw is higher lumens?  If so are there specs on the differences?

Also how does sharpness and chromatic aberrations change throughout the zoom range?

That generally is true. You might have to wait for more reviews to answer your other questions though.

[thebland]

I would guess around 26/27FL without the DCI filter in place.

Thanks, Craig - so, this is approximately what it might be based on my throw @2.40?

Again, appreciate the help here...

[AVSMike]

Thanks, Craig - so, this is approximately what it might be based on my throw @2.40?

Again, appreciate the help here...

It was me (Mike) that answered you and yes that is based on the 2.40 width of your screen. You will have much higher brightness when shooting 16:9 onto your 2.40 screen.

[AVSMike]

Here is a nice fact for people. I think most people know how QC works. Usually a set percentage of units are pulled and checked to make sure the units randomly selected meet specification. Well here in the US, with the 4500, that percentage is as high as you can get. Yep, 100%.

[AVSCraig]

Here is a nice fact for people. I think most people know how QC works. Usually a set percentage of units are pulled and checked to make sure the units randomly selected meet specification. Well here in the US, with the 4500, that percentage is as high as you can get. Yep, 100%.

JVC can send me one that is only 99.8% - if  they send it this week !